Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer

Active Publication Date: 2018-01-16
RGT UNIV OF CALIFORNIA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0029]FIG. 6(a) shows the wavelength vs time of a modified square wave that could be used to pump the coherence and repump the hyperfine levels. FIG. 6(b) shows the wavelength vs time of a simple square wave. Such a modulation waveform has a duty factor of 50%, which does not optimize the NMOR signal. Applying a square wave current modulati

Problems solved by technology

An unwanted side effect of optical pumping, particularly in coated cells, is that it also results in hyperfine pumping.
The vapor cell coatings that lead to long coherence lifetimes also result in slow relaxation

Method used

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  • Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer
  • Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer
  • Wavelength-modulated coherence pumping and hyperfine repumping for an atomic magnetometer

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Embodiment Construction

[0030]The present invention is preferably implemented using the NMOR apparatus described by U.S. Pat. No. 8,587,304, to Budker, when used in frequency modulation mode. The operation differs from that which has been previously described. The probe beam is preferably adjusted in the usual way to optimize the sensitivity. D. F. Jackson Kimball, et al., “Magnetometric sensitivity optimization for nonlinear optical rotation with frequency-modulated light: rubidium D2 line”, Journal of Applied Physics 106, 063113 (2009). In the approach by Budker this means that the probe should be detuned from the center of one of the hyperfine peaks by about one-half line width (LW), with an optical power adjusted so that line width of the NMOR resonance is not significantly broadened, or about 1 μW for a resonance width of about 10 Hz.

[0031]The modulation frequency is preferably set equal to or scanned around the region of the Larmor frequency or a sub-harmonic, not twice the Larmor frequency. However,...

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Abstract

An FM-NMOR magnetometer and concomitant magnetometry method comprising providing a linearly-polarized pump beam generator, employing a center wavelength approximately equal to a center wavelength of hyperfine peaks, and employing a modulation amplitude in the range HFS-3×LW to HFS.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0001]This invention was made with government support under Contract No. N68335-10-C-0576 awarded by the U.S. Department of the Navy. The government has certain rights in the invention.CROSS-REFERENCE TO RELATED APPLICATIONS[0002]Not Applicable.INCORPORATION BY REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC[0003]Not Applicable.COPYRIGHTED MATERIAL[0004]Not Applicable.BACKGROUND OF THE INVENTIONField of the Invention (Technical Field)[0005]The present invention relates to magnetometry, particularly atomic magnetometry in alkali vapors that are pumped with linearly polarized light. The invention provides a way to both pump an optical coherence and simultaneously provide repumping to reduce the signal loss associated with unwanted hyperfine pumping in laser-based alkali vapor magnetometers.Description of Related Art[0006]Magnetometers are used in a number of areas. These include the measurement of Earth's field to unders...

Claims

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Application Information

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IPC IPC(8): G01R33/26G01R33/032
CPCG01R33/26G01R33/032
Inventor HOVDE, DAVID CHRISTIANBUDKER, DMITRYPATTON, BRIAN
Owner RGT UNIV OF CALIFORNIA
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